Re: [REGRESSION] Thunderbolt Host Reset Change Causes eGPU Disconnection from 6.8.7=>6.8.8

[Mario Limonciello]

Can we please get some kernel logs for these two cases on the command line?

thunderbolt.dyndbg=+p
thunderbolt.dyndbg=+p thunderbolt.host_reset=false

Also what is the value for:

$ cat /sys/bus/thunderbolt/devices/domain0/iommu_dma_protection

That won't change in the two cases, but it will be really helpful to 
understand this issue.

On 5/20/2024 04:19, Gia wrote:
> Hi Thorsten,
>
> I'll try to provide a kernel log ASAP, it's not that easy because when
> I run into this issue my keyboard isn't working. The kernel parameter
> that Mario suggested, thunderbolt.host_reset=false, fixes the issue!
>
> I can add that without the suggested kernel parameter the issue
> persists with the latest Archlinux kernel 6.9.1.
>
> I also found another report of the issue on Archlinux forum:
> https://bbs.archlinux.org/viewtopic.php?id=295824
>
>
> On Mon, May 6, 2024 at 2:53 PM Linux regression tracking (Thorsten
> Leemhuis) <regressions@xxxxxxxxxxxxx> wrote:
> > [CCing Mario, who asked for the two suspected commits to be backported]
> >
> > On 06.05.24 14:24, Gia wrote:
> > > Hello, from 6.8.7=>6.8.8 I run into a similar problem with my Caldigit
> > > TS3 Plus Thunderbolt 3 dock.
> > >
> > > After the update I see this message on boot "xHCI host controller not
> > > responding, assume dead" and the dock is not working anymore. Kernel
> > > 6.8.7 works great.
> >
> > Thx for the report. Could you make the kernel log (journalctl -k/dmesg)
> > accessible somewhere?
> >
> > And have you looked into the other stuff that Mario suggested in the
> > other thread? See the following mail and the reply to it for details:
> >
> > https://lore.kernel.org/all/1eb96465-0a81-4187-b8e7-607d85617d5f@xxxxxxxxx/T/#u
> >
> > Ciao, Thorsten
> >
> > P.S.: To be sure the issue doesn't fall through the cracks unnoticed,
> > I'm adding it to regzbot, the Linux kernel regression tracking bot:
> >
> > #regzbot ^introduced v6.8.7..v6.8.8
> > #regzbot title thunderbolt: TB3 dock problems, xHCI host controller not
> > responding, assume dead